Solve for x
x=-5
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3+3x=-12
Swap sides so that all variable terms are on the left hand side.
3x=-12-3
Subtract 3 from both sides.
3x=-15
Subtract 3 from -12 to get -15.
x=\frac{-15}{3}
Divide both sides by 3.
x=-5
Divide -15 by 3 to get -5.
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Matrix
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